/**
 * Copyright (C) 2009 aileron.cc
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package cc.aileron.text.logic;

import cc.aileron.dao.G2DaoManager;
import cc.aileron.text.model.Message;
import cc.aileron.text.model.UriKey;

import com.google.inject.Inject;
import com.google.inject.Singleton;

/**
 * @author Aileron
 * 
 */
@Singleton
public class TextLogicImpl implements TextLogic
{
    @Override
    public boolean exist(final UriKey uri)
    {
        return dao.from(Message.class)
            .find(uri)
            .exist();
    }

    @Override
    public Message get(final UriKey uri)
    {
        return dao.from(Message.class)
            .find(uri)
            .one();
    }

    @Override
    public void write(final Message message)
    {
        if (message == null)
        {
            throw new NullPointerException();
        }

        if (exist(message.uriKey))
        {
            dao.from(Message.class)
                .update(message);
        }
        else
        {
            dao.from(Message.class)
                .insert(message);
        }
    }

    /**
     * @param dao
     */
    @Inject
    public TextLogicImpl(final G2DaoManager dao)
    {
        this.dao = dao;
    }

    private final G2DaoManager dao;
}
